"We always want to play better and the only thing we can focus on is getting a result in the second leg," Szczesny said.

"It doesn't have to be a pretty one but we want to get through and secure Champions League football.

"I thought it was very enjoyable. It was a fantastic atmosphere and a very tough game. It was exactly what you would expect from a Champions League fixture. It was a good test for us and we came out with a clean sheet which is a positive. We'll be confident going into the second leg."

Szczesny also praised the impact of Calum Chambers, a £16 million signing from Southampton during the summer, after the teenager produced an impressive display on his Champions League debut.

Chambers was viewed as a back up to Mathieu Debuchy on the right hand side of Arsenal's defence but has since performed well alongside Laurent Koscielny in the absence of World Cup winner Per Mertesacker.

"He's been fantastic for us and adapted very quickly to being a centre back," Szczesny added.

"He only came in pre-season so he hasn't a lot of time to train with us in this position.

"You can't tell that he's only 19 years old, he looks like a very experienced centre-back. He's doing very well at the moment."

Sunderland manager Gus Poyet says he has "no regrets whatsoever" after being sent off during his side's draw at Hull, while counterpart Steve Bruce admitted they had both acted like "a couple of children" following a touchline altercation

After enduring a tricky start to his Manchester United career, perhaps it is fair that Marcos Rojo celebrated so boisterously as he watched his first professional club Estudiantes beat fierce rivals Gimnasia